[单项选择]Wearing a seat belt saves lives; it decreases the chance of death or serious injury by more than half.
A. 系上安全带可以挽救生命，可以使死亡或严重受伤的机率减少一半以上。
B. 系上安全带能保证安全，它会减少一半以上的死亡或严重受伤的机会。
C. 戴上安全带可以救助许多人的生命，自然也使你免于重伤或死亡。
D. 系安全带能拯救生命，死亡或严重受伤的可能性会少到一半。

[简答题]Wearing a seat belt saves lives；it reduces your chance of death or serious injury by more than half．

[单项选择]Wearing a seat belt in a vehicle （　）.
A. reduces road accidents by more than half
B. saves lives while driving at a speed up to 30 miles per hour
C. reduces the death rate in traffic accident
D. saves more than 15,000 lives each year

[判断题]

According to the speaker, a seat belt and an upright seat provide less protection for car passengers.

[填空题](fasten)（）your seat-belt, please!

[单项选择]Why wasn’t the young lady wearing her seat-belt
A. She wasn’t able to make it fit her.
B. She wasn’t able to fasten it.
C. She was told not to fasten it.
D. It was unnecessary to wear the seat-belt.

[填空题]
1 In recent years, scientists have been studying ways to change the body’s chemistry to reduce the signs and effects of aging.
2 One group of researchers in Britain has performed experiments on a kind of worm. They have managed to increase the worm’s normal life span of 20 days by up to 400%. They hope that they will be able to use this research to help humans live longer. However, this is a long way in the future. Another disadvantage is that when (or if) the new technology is successfully developed, it will probably be very expensive. The chance to live longer will only be available to a very few, very rich people.
3 Another group of scientists is studying people who have reached a very old age. They believe that this may show what has kept these people healthy and alive for so long. So, if we look at people who have lived into very old age, what do they have in common Usually they have led a phy

[单项选择]Which seat would he prefer

[单项选择]

Larry saves x dollars per month. Will Larry’s total savings one year from now exceed his present savings by at least $500 (Assume that there is no interest.)（）
(1)In 6 months Larry’s total savings will be $900.
(2)In 3 months Larry’s total savings will exceed his present savings by $150.

A. 条件（1）充分，但条件（2）不充分.
B. 条件（2）充分，但条件（1）不充分.
C. 条件（1）和（2）单独都不充分，但条件（1）和条件（2）联合起来充分.
D. 条件（1）充分，条件（2）也充分.
E. 条件（1）和条件（2）单独都不充分，条件（1）和条件（2）联合起来也不充分.

[单项选择]Larry saves x dollars per month. Will Larry’s total savings one year from now exceed his present savings by at least $500 ？（）(Assume that there is no interest.)
(1)In 6 months Larry’s total savings will be $900.
(2)In 3 months Larry’s total savings will exceed his present savings by $150.
A. 条件(1)充分，但条件(2)不充分．
B. 条件(2)充分，但条件(1)不充分．
C. 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分．
D. 条件(1)充分，条件(2)也充分．
E. 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．

[单项选择]We grow all our own fruit and vegetables, （） saves money, of course.
A. which
B. as
C. that
D. what

[单项选择]Where do you think Lucia lives

[单项选择]The tropical rain forest belt extending around our planet at the equator (赤道) has taken some 60 million years to evolve to its present state. It is, quite simply, the most complex and the most important ecosystem (生态系统) (47)________ earth. Homo Faber, Man the Builder, has tragically always seen the jungle (48)________ an enemy, an environmerit (49)________, replaced with his own constructions. In the (50)________ twenty years the rate of destruction has increased alarmingly (51)________ huge areas of green, beautiful forest — an irreplaceable treasure house of living things—has given (52)________ to wasteland. The evidence is that man will redouble (53)________ destructive efforts until the forest system is smashed, and the jungle will (54)________ no more. Many experts predict the tropical rain forests will finally (55)________ around the end of our (56)________. Well done, 20th century. WORD BANK A. or B. vanish C. century D. his E. u